Modern Materials And Products

Question 0

Explain LCDS

Answer 0

When a cell containing a liquid crystal has a voltage applied, and on which light falls, it appears to go ‘dark’. This is caused by the molecular rearrangement within the liquid crystal.

Question 1

What are liquid crystals?

Answer 1

Organic, carbon-based compounds that can exhibit both liquid and solid crystal characteristics.

Question 2

LCD in digital clock watch

Answer 2

A liquid crystal display has a pattern of conducting electrodes that is capable or displaying numbers via a seven-segment display. The numbers are made to appear on the LCD by applying a voltage to certain segments, which go dark in relation to the silvered background.

Question 3

As very small amounts of current are needed to power an LCD display, what are they ideal for?

Answer 3

Portable electronic devices such as mobile phones, as battery life can be extended.

Question 4

What are phosphorescent pigments?

Answer 4

They are materials that absorb energy or ‘charge’ in normal daytime conditions and are capable of storing that energy for sometime, then releasing it reflectively slowly in the form of light.

Question 5

They are non-radioactive like the old Forms of afterglow materials, where a polycrystalline inorganic zinc sulphide pigment can be used to create a green after glow or alkaline earth sulphides to a red or blue after glow. Which modern material?

Answer 5

Phosphorescent pigments

Question 6

What can phosphorescent pigments be manufactured into

Answer 6

Polymers used in paints or inks to produce products like safety signage and watch faces that can be seen in complete darkness

Question 7

What is electroluminescent lighting

Answer 7

Converts electrical energy into light by applying a voltage across electrodes.